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HTTP Match And Replace Rules Bug

Alice | Last updated: Aug 21, 2024 04:09PM UTC

Hello, I am using Burp Suite Professional version 2024.7.4-31588. In this version, I am adding a custom header using the "Match and Replace" section under the proxy settings. For example, if the header I add is "TEST," Burp automatically changes it to "Test." I am trying to keep all the letters uppercase, but it automatically makes only the first letter uppercase. Is there a way to fix this? Thank you.

Michelle, PortSwigger Agent | Last updated: Aug 22, 2024 02:25PM UTC

Hi From what you've described it sounds like the request is being sent using HTTP/2, so what you're seeing is how the editor has normalized the request. If you look at the header value in the Inspector, if the request is using HTTP/2 then it will be in lower case. You can read more about this here: https://portswigger.net/burp/documentation/desktop/http2/http2-normalization-in-the-message-editor If the request was sent as HTTP/1, then it would use uppercase. Does this help to explain what you're seeing?

Alice | Last updated: Aug 28, 2024 06:43AM UTC